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1986年用地下采矿法开采了24%的商品铁矿石、37%的锰矿石及23.8%的铬铁矿石。克里沃罗格、乌拉尔、西伯利亚铁矿的深度已达到800～1000m,个别矿山已在1200～1400m 深的水平进行采准。虽然用地下采矿法开采矿石的比重不大,但是在很多黑色及有色矿床的某些场合下,它的技术经济条件仍然是最有效的。采矿作业深度的急剧增加(每年高达20m)必然导致矿工劳动条件的恶化。虽然近年来开发了全新的方法与设施来防止矿
In 1986, 24% of commercial iron ore, 37% of manganese ore and 23.8% of chromite ore were mined using the underground mining method. The depth of the Kriwrodog, Ural, and Siberian iron mines has reached 800-1000 m, and individual mines have been adopted at depths of 1200-1400 m. Although the underground mining method has a small share of ores, its technical and economic conditions are still the most effective in some cases of many black and colored deposits. The sharp increase in the depth of mining operations (up to 20m per year) inevitably leads to the deterioration of working conditions for miners. Although new methods and facilities have been developed to prevent mines in recent years